body {
    background: #555;
}

#icon {
    width: 64px;
    height: 64px;
    border-radius: 10px;
    box-shadow: 0 0 300px black, 0 4px 10px rgba(0,0,0,0.5);
    position: absolute;
    top: 50%;
    bottom: 50%;
    left: 50%;
    right: 50%;
    margin: auto;
    background: white;
    text-align: center;
    font-size: 40px;
    line-height: 64px;
    font-family: sans-serif;
    -webkit-animation: wiggle .1s infinite alternate;
    -webkit-transform-origin: center 60%;
}

#icon span {
    width: 20px;
    height: 20px;
    line-height: 20px;
    font-size: 16px;
    text-align: center;
    position: absolute;
    top: -8px;
    right: -8px;
    background: white;
    border: 1px solid black;
    opacity: 0.8;
    border-radius: 99px;
}

@-webkit-keyframes wiggle {
    0% { -webkit-transform: rotate(-2deg);transform: rotate(-2deg); }
    100% { -webkit-transform: rotate(2deg);transform: rotate(2deg); }
}